<template>
  <view class="viewport">
    <!-- 推荐封面 -->
    <view class="cover">
      <image :src="bannerPicture"></image>
    </view>
    <!-- tab栏 -->
    <view class="tabs">
      <text
        class="text"
        v-for="(item, index) in recommendList"
        :key="index"
        :class="{ active: index === activeIndex }"
        @tap="changeTabs(index)">
        {{ item.subTypes.title }}
      </text>
    </view>
    <!-- 列表内容 -->
    <scroll-view
      scroll-y
      class="scroll-view"
      @scrolltolower="handleScrolltolower"
      v-for="(item, index) in recommendList"
      :key="index"
      v-show="activeIndex === index">
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in item.goodsItems.items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`">
          <image
            class="thumb"
            :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view
        class="loading"
        v-if="hasMore"
        >正在加载...</view
      >
    </scroll-view>
  </view>
</template>
<script>
import { getHomeRecommend } from '@/http/home'
export default {
  data() {
    return {
      // 背景图
      bannerPicture: '',
      // 当前显示的tab栏
      activeIndex: 0,
      // 列表数据
      recommendList: [],
      // 还有更多数据
      hasMore: true
    }
  },
  async onLoad({ type }) {
    const urlMap = {
      1: { title: '特惠推荐', url: '/home/preference/mutli' },
      2: { title: '爆款推荐', url: '/home/inVogue/mutli' },
      3: { title: '一站买全', url: '/home/oneStop/mutli' },
      4: { title: '领券中心', url: '/home/new/mutli' }, // 后端未提供，暂用新鲜好物url
      5: { title: '新鲜好物', url: '/home/new/mutli' }
    }
    this.currentInfo = urlMap[type]
    uni.setNavigationBarTitle({ title: this.currentInfo.title })
    this.recommendParams = {
      page: 1,
      pageSize: 10
    }
    // 默认总页数
    this.pages = 1
    this.getHomeRecommend(this.currentInfo.url, this.recommendParams)
  },
  methods: {
    async getHomeRecommend(url, params) {
      const res = await getHomeRecommend(url, params)
      this.bannerPicture = res.result.bannerPicture
      this.recommendList = res.result.subTypes.map((v) => {
        const id = v.id
        const value = res.result.goodsItems[id]
        return {
          subTypes: v,
          goodsItems: value
        }
      })
      // this.pages = this.recommendList.goodsItem.pages
      console.log(this.pages)
    },
    changeTabs(index) {
      this.activeIndex = index
      this.recommendParams['subType'] = this.recommendList[index].subTypes.id
    },
    async handleScrolltolower() {
      this.recommendParams.page++
      // 先知道当前是对哪组数据做分页
      const currentShow = this.recommendList[this.activeIndex]
      // Tab 项的 id
      const subType = currentShow.subTypes.id
      this.recommendParams.subType = currentShow.subTypes.id
      // 拿当前页码和总页数比较  ||   拿当前数组长度 和 总条数做比较
      const { page, pages } = currentShow.goodsItems
      if (page >= pages) {
        uni.showToast({ title: '没有更多数据啦', icon: 'none' })
        this.hasMore = false
        return
      }

      const res = await getHomeRecommend(this.currentInfo.url, this.recommendParams)
      const newGoodsItems = res.result.goodsItems[subType]
      this.recommendList[this.activeIndex].goodsItems = {
        ...newGoodsItems,
        // items:[...旧的items,...新的items]
        items: [...this.recommendList[this.activeIndex].goodsItems.items, ...newGoodsItems.items]
      }
    }
  }
}
</script>
<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}

.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}

.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}

.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;

  .text {
    margin: 0 20rpx;
    position: relative;
  }

  .active {
    &::after {
      content: '';
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}

.scroll-view {
  flex: 1;
  overflow: hidden;
}

.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;

  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }

  .thumb {
    width: 305rpx;
    height: 305rpx;
  }

  .name {
    height: 88rpx;
    font-size: 26rpx;
  }

  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}

.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>
